柯石英与冲击石英来自加拿大安大略省霍利福德陨石坑。

Coesite and Shocked Quartz from Holleford Crater, Ontario, Canada.

出版信息

Science. 1963 Oct 18;142(3590):379-81. doi: 10.1126/science.142.3590.379.

DOI:10.1126/science.142.3590.379

Abstract

The Holleford Crater, a circular depression in southern Ontario, is filled with Paleozoic sediments and underlain by brecciated Precambrian igneous and metamorphic rocks. The presence of coesite in two core samples of this breccia has been established by petrographic and x-ray diflraction methods. Shattered quartz in the coesite-bearing samples exhibits planar fractures. The shocked quartz is the result of great shock pressures and the association of coesite with the shocked quartz strongly suggests that Holleford Crater originated from a hypervelocity impact.

摘要

安大略湖南部的 Holleford 陨石坑是一个圆形洼地，坑内填满了古生代沉积物，基底则是破碎的前寒武纪火成岩和变质岩。通过岩相学和 X 射线衍射方法确定，该角砾岩的两个岩芯样本中存在柯石英。含有柯石英的样本中的破碎石英显示出平面裂缝。受冲击的石英是巨大冲击压力的结果，而柯石英与受冲击的石英的共生强烈表明 Holleford 陨石坑起源于超高速撞击。